Justin Bieber ... Skrillex ... Lil Wayne -- they ain't got NOTHING on Hopsin when it comes to the skate park ... so says boarding legend Tony Hawk.
"Guy can do triple heelflips!" Hawk tells TMZ Sports. "He's no joke."
Tony was out in NYC earlier this week when he made the revelation to us ... and, gotta say -- we're pretty surprised.
Dudes like Logic, Wiz Khalifa, Rich the Kid and even Chris Brown have been spotted shredding on four wheels -- but Hawk tells us the "Sag My Pants" rapper tops them all.